I recently found October CMS, a PHP web framework explicitly created for developer experience. It is such a pleasure to work with, really a breath of fresh air for a CMS to be developer-first.

And the thing is, if a tool has a nice developer experience, it's easier for the developer to make the product better for their users,tailored for their needs. In contrast, a user-focused product either assumes knowledge about the user, and developers have to fight it to work with the nuance of their specific case, or else it has every conceivable feature to account for everyone, and becomes overwhelmingly complex.